Abrasive stone holder



May 9, 1933.

G. M. CALVERT ABRAS IVE STONE HOLDER Filed Nov. 11, 1931 INVENTOR 67621 M. C'aZ/ert.

ATTORN EY Patented May 9,1933

. UNITED STATES PATENT OFFICE GLEN I. CALVERT, OF GBDSOE rom'm, IICHIGAN, ASSIGNOB 'I'O IIOBOKL'IIO KO CORPORATION, A CORPORATION OF MICHIGAN nmm aroma nomna Application fled Iovemb'er 11, 1981. Serial No. 574,381.

This invention relates to improved holders for abrasive elements and particularly to a holder which is an improvement on that illustrated and described in the patent to F. J. Jeschke, No. 1,821,518 issued September 1, 1931, and assigned to the assignee of the present invention. a

The holder illustrated and described in the patent was channel shaped in cross section to receive the base of the stone and constituted the means by which the stone was attached to the honing tool. The metal from which the holder was made, was comparatively soft, relative to the degree of hardness of the receiving member, which was part of the tool and so mounted as to be adjustable to permit the longitudinal tilting of the elements to conform to the S10 e of the inner wall of the cylinder. The si es of the channel shaped holder, when in contiguous relation to the groove in the receivmg member, projected some distance above the edges.

the abrasive elements to wear on one end faster than on the other and as a resulta all the abrasive material of the elements could be utilized before the elements need be thrown away. Care, however, was exercised to prevent the wearing of the s des ofthe channel holder to such a degree as to permit the hard material of the receiving member from contacting and damaging the cylinder surface.

In practicing my invention I extend the beneficial results obtained from the use of the channel shaped member by flanging the upstanding sides outwardly at right angles thereto, to reduce the height or the sides and at the same time to retain the holding effect by having the laterally extending sides engage the top surface of the receiving member. This construction not only exposes a greater depth of abrasive material but also protects the cylinder walls from the metal of the receiving member because of the laterally extending flanges which project over the top edges of the member. It was found from experiment that, when the upstandin sides of the channel member were flang outwardly and reduced in height, the abrasive elements, when wearing faster on one end than on the other, will wear more rapidly on the one end when the end opposite thereto has the laterally extending flanges in engagement with the cylinder wall. The wearmg of the abrasive material will be much more rapid than that of the metal flanges and all of the material will be worn down a to the flange before one endof the flange will be worn through to expose the hard material of the retaining member, which thereby obviates" the'possibility of the retainin member ever engaging-the cylinder W151 and causing it to be scored.

The main objects of'my' invention are: to provide a backing member for an abrasive elementwhich'is of shallow channel section having the sides thereof extended laterally to form flanges which project over the element retaining member; to provide an adhesive substance for binding the abrasive elements to the metal member; and to rovide a finish to the backing member w ich" provides a rough surface to which the adhesive material adheres for firmly securing '95 the abrasive element to the bottom and sides of the member.

Other objects and features of novelty of, I

my inventlon will either be specifically pointed out or will become apparent when referring, for a better understanding of my invention, to the following description in conjunction with the accompanying drawin wherein:

Tigure 1 is a perspective new of an abrasive element and holder mounted in a receiving member which forms part of the honing tool,

Fig. 2 is a perspective view of a honing element with the abrasive member and the adhesive material broken away to illustrate the relation of the member to the holder, and

Fig. 3 is a sectional view of the structure illustrated in Fig. 1, taken on the l1ne3-3 thereof.

My invention comprises 1n general a honing element receiving member whlch 1s part of the honing tool and which 18 mounted therein in such manner as to have the element tiltable longitudinally of its length. A recess 6 is provided in the outer face of the member for receiving a honing element 7 which comprises a metal backing member 8 and an abrasive member 9 which is attached thereto through the medium of an adhesive material 11.

The backing member 8, as illustrated in the fi res, is of shallow channel construction, eing provided with a ma1n web 12 having upstanding sides 13 which are flanged at 14 to extend laterally of the sides parallel to the plane of the web 12. The ends 15 of the web 12 are extended and bent in such shape, as illustrated in Figs. 2 and 3, as to engage the ends of the abrasive element and to receive supporting members by which the backing member is retained in fixed relation to the receiving member 5 The honing element is prevented from tilting relative to the receiving member 5 through the engagement of the sides 13 and the lateral flanges M with the sides and top thereof when supported thereagainst through the med um of the spring members (not shown) which enga e the ends 15 of the backmg member.

or preventing the relative longitudinal movement between the holding element 7 and thereceiving member 5, I have provided a plurality of rearwardly extending pro ections 16 which are pressed from the web 12, as illustrated more clearly in Flg. 3, and which register with apertures 17 provlded 1n the body portion of the receiving member.

After the backing member 8 has been formed as illustrated in the figure, I rou h the inner surface of the channel portion y sand blasting, etching, or like methods, for the purpose of roughing the surface to provide a bond between the adhesive material and the metal so that the abrasive element 9 may be securely attached thereto. It is to be understood that I may utilize the Parkerizing process which is a method well known in the art for providing a rust-proof coating on metal to prevent its oxidation, which I have found to be sufficiently rough to eifect a bond between the adhesive material 11 and the metal. The adhesive material may be any glue, shellac or-cellulose compound well known in the art to be suitable for adhering an abraslve element to a roughened metal member. The employment of the well known Parkerizing process not only pro vides a roughened surface for effecting the bond, but also. prevents the oxidation of the metal which goes to make up the backing element.

ber prevents the edges of the hard metal thereof from contacting with the cylinder wall which would cause it to be scored. The lateral extending flanges are of further benefit in causing the stone to be worn until it substantially engages the flanges throughout the entire length of the backing member.

While I have described and illustrated but a single embodiment of my invention, it will be apparent to those skilled in the art that various changes, omissions, additions and substitutions mag be made therein without departing from t e spirit and scope of my invention as set forth in the accompanying claims.

I claim as my invention:

1. A honing element for a grinding tool including, an abrasive element and a metal backing member therefor having upstanding sides which are flanged laterally at their up-.

per ends outwardly from the element.

2. A honing element fora grinding tool including, an abrasive element, and a metal backing plate therefor of channel section having the sides thereof flanged outwardlyv of said channel and having the web of the channel extended and shaped to project over the ends of the element.

3. A honin element for a grinding tool including, an a rasive element, and a channel shaped backing member for the element having the channel sides flanged laterally and having the web of the channel extended and shaped to project over the ends of the element and further extended and shaped to form retaining members for holding the element on the tool.

4. An abrasive element receiving member of a grinding tool having a longitudinally disposed slot therein, in combination with a backing plate for the abrasive element made of metal and of channel shape with the side portions flanged for extending over the top surface of the receiving member.

5. An abrasive element receiving member for a grinding tool having a longitudinally disposed slot, in combination with an abrasive element, a backing member shaped to receive said abrasive element and to fit in the groove of said retaining member, and flanges on the side of said backing element extending laterally for projecting over the top surface of said receiving member.

6. An abrasive element receiving member for a grinding tool having a longitudinally disposed slot therein, in combination with an abrasive element, a backing member shaped to receive said abrasive element and to fit in the groove of said retaining member, flanges on the side of said backing element extending laterally for projecting over the top surface of said receiving member, projections on said backing member for engaging the ends of said abrasive element.

7 An abrasive element receiving member for a grinding tool having a longitudinally disposed slot therein, in combination with an abrasive element, a backing member shaped to receive said abrasive element and to fit in the groove of said retaining member, flanges on the side of said backing element extending laterally for projectin over the top surface of said receiving mem er, longitudinal proections on said backing member for engaging the ends of said abrasive element, said extensionbeing further projected to form members by means of which the'abrasi-ve member is attached to the tool.

8. An abrasive element receiving member for a grinding tool having a longitudinally disposed slot, in combination, with an abrasive element, a backing member shaped to receive said abrasive element and to fit in the groove of said retaining member, flanges on the side of said backing element extending laterally for projecting over the top surface of said receiving member, and an adhesive material for retaining the abrasive element in firm fixed relation to the backing member. 9. A radially adjustable abrading element receiving member for a honing tool, in combination with a channel-shaped backing member for an abrading element with the side flanges extending outwardly, and means for positioning the backing plate relative-to the adjustable element.

10. A radially adjustable abrading ele ment receiving member for a honing tool, in combination with a channel-shaped backing member for an abrading element with the side flanges extended outwardly and the web portion extended and bent downwardly to Extend over the ends of the receiving memer. a

11. A radially adjustable abrading element receiving member for a honing tool, in combination with a channel-shaped backing and longitudinal member for an abrading element with the side flanges extended outwardly and the web port ons extended and bent downwardly to extend over the ends of the receivin member, and further bent to provide olding means at the ends thereof.

12. A radially adjustable abrading element rece 1v1ng member for a honing tool, in combination with a channel-shaped backing member for an abrading element with the side flanges extended outwardly and the web portlons extended and bent downwardly to Extend oyter thefendi of the receiving memer, apo ion 0 sai web en a in th of the abrading element. g g g 6 ends 13. A radially adjustable abrading element rece 1v1ng member "for a honing tool, in combination with a channel shaped backing member for an abrading element with the side flanges extended outwardly and the web I ing element.

GLEN M. CALVERT. 

